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[kopensolaris-gnu/glibc.git] / timezone / zic.c
1 static char     elsieid[] = "@(#)zic.c  7.128";
2
3 /*
4 ** Regardless of the type of time_t, we do our work using this type.
5 */
6
7 typedef int     zic_t;
8
9 #include "private.h"
10 #include "locale.h"
11 #include "tzfile.h"
12
13 #ifndef ZIC_MAX_ABBR_LEN_WO_WARN
14 #define ZIC_MAX_ABBR_LEN_WO_WARN        6
15 #endif /* !defined ZIC_MAX_ABBR_LEN_WO_WARN */
16
17 #if HAVE_SYS_STAT_H
18 #include "sys/stat.h"
19 #endif
20 #ifdef S_IRUSR
21 #define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
22 #else
23 #define MKDIR_UMASK 0755
24 #endif
25
26 /*
27 ** On some ancient hosts, predicates like `isspace(C)' are defined
28 ** only if isascii(C) || C == EOF. Modern hosts obey the C Standard,
29 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
30 ** Neither the C Standard nor Posix require that `isascii' exist.
31 ** For portability, we check both ancient and modern requirements.
32 ** If isascii is not defined, the isascii check succeeds trivially.
33 */
34 #include "ctype.h"
35 #ifndef isascii
36 #define isascii(x) 1
37 #endif
38
39 struct rule {
40         const char *    r_filename;
41         int             r_linenum;
42         const char *    r_name;
43
44         int             r_loyear;       /* for example, 1986 */
45         int             r_hiyear;       /* for example, 1986 */
46         const char *    r_yrtype;
47
48         int             r_month;        /* 0..11 */
49
50         int             r_dycode;       /* see below */
51         int             r_dayofmonth;
52         int             r_wday;
53
54         long            r_tod;          /* time from midnight */
55         int             r_todisstd;     /* above is standard time if TRUE */
56                                         /* or wall clock time if FALSE */
57         int             r_todisgmt;     /* above is GMT if TRUE */
58                                         /* or local time if FALSE */
59         long            r_stdoff;       /* offset from standard time */
60         const char *    r_abbrvar;      /* variable part of abbreviation */
61
62         int             r_todo;         /* a rule to do (used in outzone) */
63         zic_t           r_temp;         /* used in outzone */
64 };
65
66 /*
67 **      r_dycode                r_dayofmonth    r_wday
68 */
69
70 #define DC_DOM          0       /* 1..31 */     /* unused */
71 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
72 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
73
74 struct zone {
75         const char *    z_filename;
76         int             z_linenum;
77
78         const char *    z_name;
79         long            z_gmtoff;
80         const char *    z_rule;
81         const char *    z_format;
82
83         long            z_stdoff;
84
85         struct rule *   z_rules;
86         int             z_nrules;
87
88         struct rule     z_untilrule;
89         zic_t           z_untiltime;
90 };
91
92 extern int      getopt P((int argc, char * const argv[],
93                         const char * options));
94 extern int      link P((const char * fromname, const char * toname));
95 extern char *   optarg;
96 extern int      optind;
97
98 static void     addtt P((zic_t starttime, int type));
99 static int      addtype P((long gmtoff, const char * abbr, int isdst,
100                                 int ttisstd, int ttisgmt));
101 static void     leapadd P((zic_t t, int positive, int rolling, int count));
102 static void     adjleap P((void));
103 static void     associate P((void));
104 static int      ciequal P((const char * ap, const char * bp));
105 static void     convert P((long val, char * buf));
106 static void     dolink P((const char * fromfile, const char * tofile));
107 static void     doabbr P((char * abbr, const char * format,
108                         const char * letters, int isdst));
109 static void     eat P((const char * name, int num));
110 static void     eats P((const char * name, int num,
111                         const char * rname, int rnum));
112 static long     eitol P((int i));
113 static void     error P((const char * message));
114 static char **  getfields P((char * buf));
115 static long     gethms P((const char * string, const char * errstrng,
116                         int signable));
117 static void     infile P((const char * filename));
118 static void     inleap P((char ** fields, int nfields));
119 static void     inlink P((char ** fields, int nfields));
120 static void     inrule P((char ** fields, int nfields));
121 static int      inzcont P((char ** fields, int nfields));
122 static int      inzone P((char ** fields, int nfields));
123 static int      inzsub P((char ** fields, int nfields, int iscont));
124 static int      itsabbr P((const char * abbr, const char * word));
125 static int      itsdir P((const char * name));
126 static int      lowerit P((int c));
127 static char *   memcheck P((char * tocheck));
128 static int      mkdirs P((char * filename));
129 static void     newabbr P((const char * abbr));
130 static long     oadd P((long t1, long t2));
131 static void     outzone P((const struct zone * zp, int ntzones));
132 static void     puttzcode P((long code, FILE * fp));
133 static int      rcomp P((const void * leftp, const void * rightp));
134 static zic_t    rpytime P((const struct rule * rp, int wantedy));
135 static void     rulesub P((struct rule * rp,
136                         const char * loyearp, const char * hiyearp,
137                         const char * typep, const char * monthp,
138                         const char * dayp, const char * timep));
139 static void     setboundaries P((void));
140 static zic_t    tadd P((zic_t t1, long t2));
141 static void     usage P((void));
142 static void     writezone P((const char * name));
143 static int      yearistype P((int year, const char * type));
144
145 #if !HAVE_STRERROR
146 static char *   strerror P((int));
147 #endif /* !HAVE_STRERROR */
148
149 static int              charcnt;
150 static int              errors;
151 static const char *     filename;
152 static int              leapcnt;
153 static int              linenum;
154 static zic_t            max_time;
155 static int              max_year;
156 static int              max_year_representable;
157 static zic_t            min_time;
158 static int              min_year;
159 static int              min_year_representable;
160 static int              noise;
161 static const char *     rfilename;
162 static int              rlinenum;
163 static const char *     progname;
164 static int              timecnt;
165 static int              typecnt;
166
167 /*
168 ** Line codes.
169 */
170
171 #define LC_RULE         0
172 #define LC_ZONE         1
173 #define LC_LINK         2
174 #define LC_LEAP         3
175
176 /*
177 ** Which fields are which on a Zone line.
178 */
179
180 #define ZF_NAME         1
181 #define ZF_GMTOFF       2
182 #define ZF_RULE         3
183 #define ZF_FORMAT       4
184 #define ZF_TILYEAR      5
185 #define ZF_TILMONTH     6
186 #define ZF_TILDAY       7
187 #define ZF_TILTIME      8
188 #define ZONE_MINFIELDS  5
189 #define ZONE_MAXFIELDS  9
190
191 /*
192 ** Which fields are which on a Zone continuation line.
193 */
194
195 #define ZFC_GMTOFF      0
196 #define ZFC_RULE        1
197 #define ZFC_FORMAT      2
198 #define ZFC_TILYEAR     3
199 #define ZFC_TILMONTH    4
200 #define ZFC_TILDAY      5
201 #define ZFC_TILTIME     6
202 #define ZONEC_MINFIELDS 3
203 #define ZONEC_MAXFIELDS 7
204
205 /*
206 ** Which files are which on a Rule line.
207 */
208
209 #define RF_NAME         1
210 #define RF_LOYEAR       2
211 #define RF_HIYEAR       3
212 #define RF_COMMAND      4
213 #define RF_MONTH        5
214 #define RF_DAY          6
215 #define RF_TOD          7
216 #define RF_STDOFF       8
217 #define RF_ABBRVAR      9
218 #define RULE_FIELDS     10
219
220 /*
221 ** Which fields are which on a Link line.
222 */
223
224 #define LF_FROM         1
225 #define LF_TO           2
226 #define LINK_FIELDS     3
227
228 /*
229 ** Which fields are which on a Leap line.
230 */
231
232 #define LP_YEAR         1
233 #define LP_MONTH        2
234 #define LP_DAY          3
235 #define LP_TIME         4
236 #define LP_CORR         5
237 #define LP_ROLL         6
238 #define LEAP_FIELDS     7
239
240 /*
241 ** Year synonyms.
242 */
243
244 #define YR_MINIMUM      0
245 #define YR_MAXIMUM      1
246 #define YR_ONLY         2
247
248 static struct rule *    rules;
249 static int              nrules; /* number of rules */
250
251 static struct zone *    zones;
252 static int              nzones; /* number of zones */
253
254 struct link {
255         const char *    l_filename;
256         int             l_linenum;
257         const char *    l_from;
258         const char *    l_to;
259 };
260
261 static struct link *    links;
262 static int              nlinks;
263
264 struct lookup {
265         const char *    l_word;
266         const int       l_value;
267 };
268
269 static struct lookup const *    byword P((const char * string,
270                                         const struct lookup * lp));
271
272 static struct lookup const      line_codes[] = {
273         { "Rule",       LC_RULE },
274         { "Zone",       LC_ZONE },
275         { "Link",       LC_LINK },
276         { "Leap",       LC_LEAP },
277         { NULL,         0}
278 };
279
280 static struct lookup const      mon_names[] = {
281         { "January",    TM_JANUARY },
282         { "February",   TM_FEBRUARY },
283         { "March",      TM_MARCH },
284         { "April",      TM_APRIL },
285         { "May",        TM_MAY },
286         { "June",       TM_JUNE },
287         { "July",       TM_JULY },
288         { "August",     TM_AUGUST },
289         { "September",  TM_SEPTEMBER },
290         { "October",    TM_OCTOBER },
291         { "November",   TM_NOVEMBER },
292         { "December",   TM_DECEMBER },
293         { NULL,         0 }
294 };
295
296 static struct lookup const      wday_names[] = {
297         { "Sunday",     TM_SUNDAY },
298         { "Monday",     TM_MONDAY },
299         { "Tuesday",    TM_TUESDAY },
300         { "Wednesday",  TM_WEDNESDAY },
301         { "Thursday",   TM_THURSDAY },
302         { "Friday",     TM_FRIDAY },
303         { "Saturday",   TM_SATURDAY },
304         { NULL,         0 }
305 };
306
307 static struct lookup const      lasts[] = {
308         { "last-Sunday",        TM_SUNDAY },
309         { "last-Monday",        TM_MONDAY },
310         { "last-Tuesday",       TM_TUESDAY },
311         { "last-Wednesday",     TM_WEDNESDAY },
312         { "last-Thursday",      TM_THURSDAY },
313         { "last-Friday",        TM_FRIDAY },
314         { "last-Saturday",      TM_SATURDAY },
315         { NULL,                 0 }
316 };
317
318 static struct lookup const      begin_years[] = {
319         { "minimum",    YR_MINIMUM },
320         { "maximum",    YR_MAXIMUM },
321         { NULL,         0 }
322 };
323
324 static struct lookup const      end_years[] = {
325         { "minimum",    YR_MINIMUM },
326         { "maximum",    YR_MAXIMUM },
327         { "only",       YR_ONLY },
328         { NULL,         0 }
329 };
330
331 static struct lookup const      leap_types[] = {
332         { "Rolling",    TRUE },
333         { "Stationary", FALSE },
334         { NULL,         0 }
335 };
336
337 static const int        len_months[2][MONSPERYEAR] = {
338         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
339         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
340 };
341
342 static const int        len_years[2] = {
343         DAYSPERNYEAR, DAYSPERLYEAR
344 };
345
346 static struct attype {
347         zic_t           at;
348         unsigned char   type;
349 }                       attypes[TZ_MAX_TIMES];
350 static long             gmtoffs[TZ_MAX_TYPES];
351 static char             isdsts[TZ_MAX_TYPES];
352 static unsigned char    abbrinds[TZ_MAX_TYPES];
353 static char             ttisstds[TZ_MAX_TYPES];
354 static char             ttisgmts[TZ_MAX_TYPES];
355 static char             chars[TZ_MAX_CHARS];
356 static zic_t            trans[TZ_MAX_LEAPS];
357 static long             corr[TZ_MAX_LEAPS];
358 static char             roll[TZ_MAX_LEAPS];
359
360 /*
361 ** Memory allocation.
362 */
363
364 static char *
365 memcheck(ptr)
366 char * const    ptr;
367 {
368         if (ptr == NULL) {
369                 const char *e = strerror(errno);
370
371                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
372                         progname, e);
373                 exit(EXIT_FAILURE);
374         }
375         return ptr;
376 }
377
378 #define emalloc(size)           memcheck(imalloc(size))
379 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
380 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
381 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
382
383 /*
384 ** Error handling.
385 */
386
387 #if !HAVE_STRERROR
388 static char *
389 strerror(errnum)
390 int     errnum;
391 {
392         extern char *   sys_errlist[];
393         extern int      sys_nerr;
394
395         return (errnum > 0 && errnum <= sys_nerr) ?
396                 sys_errlist[errnum] : _("Unknown system error");
397 }
398 #endif /* !HAVE_STRERROR */
399
400 static void
401 eats(name, num, rname, rnum)
402 const char * const      name;
403 const int               num;
404 const char * const      rname;
405 const int               rnum;
406 {
407         filename = name;
408         linenum = num;
409         rfilename = rname;
410         rlinenum = rnum;
411 }
412
413 static void
414 eat(name, num)
415 const char * const      name;
416 const int               num;
417 {
418         eats(name, num, (char *) NULL, -1);
419 }
420
421 static void
422 error(string)
423 const char * const      string;
424 {
425         /*
426         ** Match the format of "cc" to allow sh users to
427         **      zic ... 2>&1 | error -t "*" -v
428         ** on BSD systems.
429         */
430         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
431                 filename, linenum, string);
432         if (rfilename != NULL)
433                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
434                         rfilename, rlinenum);
435         (void) fprintf(stderr, "\n");
436         ++errors;
437 }
438
439 static void
440 warning(string)
441 const char * const      string;
442 {
443         char *  cp;
444
445         cp = ecpyalloc(_("warning: "));
446         cp = ecatalloc(cp, string);
447         error(cp);
448         ifree(cp);
449         --errors;
450 }
451
452 static void
453 usage P((void))
454 {
455         (void) fprintf(stderr, _("%s: usage is %s \
456 [ --version ] [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\
457 \t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
458                 progname, progname);
459         exit(EXIT_FAILURE);
460 }
461
462 static const char *     psxrules;
463 static const char *     lcltime;
464 static const char *     directory;
465 static const char *     leapsec;
466 static const char *     yitcommand;
467 static int              sflag = FALSE;
468
469 int
470 main(argc, argv)
471 int     argc;
472 char *  argv[];
473 {
474         register int    i;
475         register int    j;
476         register int    c;
477
478 #ifdef unix
479         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
480 #endif /* defined unix */
481 #if HAVE_GETTEXT
482         (void) setlocale(LC_ALL, "");
483 #ifdef TZ_DOMAINDIR
484         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
485 #endif /* defined TEXTDOMAINDIR */
486         (void) textdomain(TZ_DOMAIN);
487 #endif /* HAVE_GETTEXT */
488         progname = argv[0];
489         for (i = 1; i < argc; ++i)
490                 if (strcmp(argv[i], "--version") == 0) {
491                         (void) printf("%s\n", elsieid);
492                         exit(EXIT_SUCCESS);
493                 }
494         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
495                 switch (c) {
496                         default:
497                                 usage();
498                         case 'd':
499                                 if (directory == NULL)
500                                         directory = optarg;
501                                 else {
502                                         (void) fprintf(stderr,
503 _("%s: More than one -d option specified\n"),
504                                                 progname);
505                                         exit(EXIT_FAILURE);
506                                 }
507                                 break;
508                         case 'l':
509                                 if (lcltime == NULL)
510                                         lcltime = optarg;
511                                 else {
512                                         (void) fprintf(stderr,
513 _("%s: More than one -l option specified\n"),
514                                                 progname);
515                                         exit(EXIT_FAILURE);
516                                 }
517                                 break;
518                         case 'p':
519                                 if (psxrules == NULL)
520                                         psxrules = optarg;
521                                 else {
522                                         (void) fprintf(stderr,
523 _("%s: More than one -p option specified\n"),
524                                                 progname);
525                                         exit(EXIT_FAILURE);
526                                 }
527                                 break;
528                         case 'y':
529                                 if (yitcommand == NULL)
530                                         yitcommand = optarg;
531                                 else {
532                                         (void) fprintf(stderr,
533 _("%s: More than one -y option specified\n"),
534                                                 progname);
535                                         exit(EXIT_FAILURE);
536                                 }
537                                 break;
538                         case 'L':
539                                 if (leapsec == NULL)
540                                         leapsec = optarg;
541                                 else {
542                                         (void) fprintf(stderr,
543 _("%s: More than one -L option specified\n"),
544                                                 progname);
545                                         exit(EXIT_FAILURE);
546                                 }
547                                 break;
548                         case 'v':
549                                 noise = TRUE;
550                                 break;
551                         case 's':
552                                 sflag = TRUE;
553                                 break;
554                 }
555         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
556                 usage();        /* usage message by request */
557         if (directory == NULL)
558                 directory = TZDIR;
559         if (yitcommand == NULL)
560                 yitcommand = "yearistype";
561
562         setboundaries();
563
564         if (optind < argc && leapsec != NULL) {
565                 infile(leapsec);
566                 adjleap();
567         }
568
569         for (i = optind; i < argc; ++i)
570                 infile(argv[i]);
571         if (errors)
572                 exit(EXIT_FAILURE);
573         associate();
574         for (i = 0; i < nzones; i = j) {
575                 /*
576                 ** Find the next non-continuation zone entry.
577                 */
578                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
579                         continue;
580                 outzone(&zones[i], j - i);
581         }
582         /*
583         ** Make links.
584         */
585         for (i = 0; i < nlinks; ++i) {
586                 eat(links[i].l_filename, links[i].l_linenum);
587                 dolink(links[i].l_from, links[i].l_to);
588                 if (noise)
589                         for (j = 0; j < nlinks; ++j)
590                                 if (strcmp(links[i].l_to,
591                                         links[j].l_from) == 0)
592                                                 warning(_("link to link"));
593         }
594         if (lcltime != NULL) {
595                 eat("command line", 1);
596                 dolink(lcltime, TZDEFAULT);
597         }
598         if (psxrules != NULL) {
599                 eat("command line", 1);
600                 dolink(psxrules, TZDEFRULES);
601         }
602         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
603 }
604
605 static void
606 dolink(fromfile, tofile)
607 const char * const      fromfile;
608 const char * const      tofile;
609 {
610         register char * fromname;
611         register char * toname;
612
613         if (fromfile[0] == '/')
614                 fromname = ecpyalloc(fromfile);
615         else {
616                 fromname = ecpyalloc(directory);
617                 fromname = ecatalloc(fromname, "/");
618                 fromname = ecatalloc(fromname, fromfile);
619         }
620         if (tofile[0] == '/')
621                 toname = ecpyalloc(tofile);
622         else {
623                 toname = ecpyalloc(directory);
624                 toname = ecatalloc(toname, "/");
625                 toname = ecatalloc(toname, tofile);
626         }
627         /*
628         ** We get to be careful here since
629         ** there's a fair chance of root running us.
630         */
631         if (!itsdir(toname))
632                 (void) remove(toname);
633         if (link(fromname, toname) != 0) {
634                 int     result;
635
636                 if (mkdirs(toname) != 0)
637                         exit(EXIT_FAILURE);
638
639                 result = link(fromname, toname);
640 #if HAVE_SYMLINK
641                 if (result != 0 &&
642                         access(fromname, F_OK) == 0 &&
643                         !itsdir(fromname)) {
644                                 const char *s = tofile;
645                                 register char * symlinkcontents = NULL;
646
647                                 while ((s = strchr(s+1, '/')) != NULL)
648                                         symlinkcontents =
649                                                 ecatalloc(symlinkcontents,
650                                                 "../");
651                                 symlinkcontents =
652                                         ecatalloc(symlinkcontents,
653                                         fromname);
654                                 result = symlink(symlinkcontents,
655                                         toname);
656                                 if (result == 0)
657 warning(_("hard link failed, symbolic link used"));
658                                 ifree(symlinkcontents);
659                 }
660 #endif /* HAVE_SYMLINK */
661                 if (result != 0) {
662                         const char *e = strerror(errno);
663
664                         (void) fprintf(stderr,
665                                 _("%s: Can't link from %s to %s: %s\n"),
666                                 progname, fromname, toname, e);
667                         exit(EXIT_FAILURE);
668                 }
669         }
670         ifree(fromname);
671         ifree(toname);
672 }
673
674 #ifndef INT_MAX
675 #define INT_MAX ((int) (((unsigned)~0)>>1))
676 #endif /* !defined INT_MAX */
677
678 #ifndef INT_MIN
679 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
680 #endif /* !defined INT_MIN */
681
682 /*
683 ** The tz file format currently allows at most 32-bit quantities.
684 ** This restriction should be removed before signed 32-bit values
685 ** wrap around in 2038, but unfortunately this will require a
686 ** change to the tz file format.
687 */
688
689 #define MAX_BITS_IN_FILE        32
690 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(zic_t) < MAX_BITS_IN_FILE) ? \
691                                         TYPE_BIT(zic_t) : MAX_BITS_IN_FILE)
692
693 static void
694 setboundaries P((void))
695 {
696         register int    i;
697
698         if (TYPE_SIGNED(zic_t)) {
699                 min_time = -1;
700                 for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
701                         min_time *= 2;
702                 max_time = -(min_time + 1);
703                 if (sflag)
704                         min_time = 0;
705         } else {
706                 min_time = 0;
707                 max_time = 2 - sflag;
708                 for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
709                         max_time *= 2;
710                 --max_time;
711         }
712         {
713                 time_t  t;
714
715                 t = (time_t) min_time;
716                 min_year = TM_YEAR_BASE + gmtime(&t)->tm_year;
717                 t = (time_t) max_time;
718                 max_year = TM_YEAR_BASE + gmtime(&t)->tm_year;
719         }
720         min_year_representable = min_year;
721         max_year_representable = max_year;
722 }
723
724 static int
725 itsdir(name)
726 const char * const      name;
727 {
728         register char * myname;
729         register int    accres;
730
731         myname = ecpyalloc(name);
732         myname = ecatalloc(myname, "/.");
733         accres = access(myname, F_OK);
734         ifree(myname);
735         return accres == 0;
736 }
737
738 /*
739 ** Associate sets of rules with zones.
740 */
741
742 /*
743 ** Sort by rule name.
744 */
745
746 static int
747 rcomp(cp1, cp2)
748 const void *    cp1;
749 const void *    cp2;
750 {
751         return strcmp(((const struct rule *) cp1)->r_name,
752                 ((const struct rule *) cp2)->r_name);
753 }
754
755 static void
756 associate P((void))
757 {
758         register struct zone *  zp;
759         register struct rule *  rp;
760         register int            base, out;
761         register int            i, j;
762
763         if (nrules != 0) {
764                 (void) qsort((void *) rules, (size_t) nrules,
765                         (size_t) sizeof *rules, rcomp);
766                 for (i = 0; i < nrules - 1; ++i) {
767                         if (strcmp(rules[i].r_name,
768                                 rules[i + 1].r_name) != 0)
769                                         continue;
770                         if (strcmp(rules[i].r_filename,
771                                 rules[i + 1].r_filename) == 0)
772                                         continue;
773                         eat(rules[i].r_filename, rules[i].r_linenum);
774                         warning(_("same rule name in multiple files"));
775                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
776                         warning(_("same rule name in multiple files"));
777                         for (j = i + 2; j < nrules; ++j) {
778                                 if (strcmp(rules[i].r_name,
779                                         rules[j].r_name) != 0)
780                                                 break;
781                                 if (strcmp(rules[i].r_filename,
782                                         rules[j].r_filename) == 0)
783                                                 continue;
784                                 if (strcmp(rules[i + 1].r_filename,
785                                         rules[j].r_filename) == 0)
786                                                 continue;
787                                 break;
788                         }
789                         i = j - 1;
790                 }
791         }
792         for (i = 0; i < nzones; ++i) {
793                 zp = &zones[i];
794                 zp->z_rules = NULL;
795                 zp->z_nrules = 0;
796         }
797         for (base = 0; base < nrules; base = out) {
798                 rp = &rules[base];
799                 for (out = base + 1; out < nrules; ++out)
800                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
801                                 break;
802                 for (i = 0; i < nzones; ++i) {
803                         zp = &zones[i];
804                         if (strcmp(zp->z_rule, rp->r_name) != 0)
805                                 continue;
806                         zp->z_rules = rp;
807                         zp->z_nrules = out - base;
808                 }
809         }
810         for (i = 0; i < nzones; ++i) {
811                 zp = &zones[i];
812                 if (zp->z_nrules == 0) {
813                         /*
814                         ** Maybe we have a local standard time offset.
815                         */
816                         eat(zp->z_filename, zp->z_linenum);
817                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
818                                 TRUE);
819                         /*
820                         ** Note, though, that if there's no rule,
821                         ** a '%s' in the format is a bad thing.
822                         */
823                         if (strchr(zp->z_format, '%') != 0)
824                                 error(_("%s in ruleless zone"));
825                 }
826         }
827         if (errors)
828                 exit(EXIT_FAILURE);
829 }
830
831 static void
832 infile(name)
833 const char *    name;
834 {
835         register FILE *                 fp;
836         register char **                fields;
837         register char *                 cp;
838         register const struct lookup *  lp;
839         register int                    nfields;
840         register int                    wantcont;
841         register int                    num;
842         char                            buf[BUFSIZ];
843
844         if (strcmp(name, "-") == 0) {
845                 name = _("standard input");
846                 fp = stdin;
847         } else if ((fp = fopen(name, "r")) == NULL) {
848                 const char *e = strerror(errno);
849
850                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
851                         progname, name, e);
852                 exit(EXIT_FAILURE);
853         }
854         wantcont = FALSE;
855         for (num = 1; ; ++num) {
856                 eat(name, num);
857                 if (fgets(buf, (int) sizeof buf, fp) != buf)
858                         break;
859                 cp = strchr(buf, '\n');
860                 if (cp == NULL) {
861                         error(_("line too long"));
862                         exit(EXIT_FAILURE);
863                 }
864                 *cp = '\0';
865                 fields = getfields(buf);
866                 nfields = 0;
867                 while (fields[nfields] != NULL) {
868                         static char     nada;
869
870                         if (strcmp(fields[nfields], "-") == 0)
871                                 fields[nfields] = &nada;
872                         ++nfields;
873                 }
874                 if (nfields == 0) {
875                         /* nothing to do */
876                 } else if (wantcont) {
877                         wantcont = inzcont(fields, nfields);
878                 } else {
879                         lp = byword(fields[0], line_codes);
880                         if (lp == NULL)
881                                 error(_("input line of unknown type"));
882                         else switch ((int) (lp->l_value)) {
883                                 case LC_RULE:
884                                         inrule(fields, nfields);
885                                         wantcont = FALSE;
886                                         break;
887                                 case LC_ZONE:
888                                         wantcont = inzone(fields, nfields);
889                                         break;
890                                 case LC_LINK:
891                                         inlink(fields, nfields);
892                                         wantcont = FALSE;
893                                         break;
894                                 case LC_LEAP:
895                                         if (name != leapsec)
896                                                 (void) fprintf(stderr,
897 _("%s: Leap line in non leap seconds file %s\n"),
898                                                         progname, name);
899                                         else    inleap(fields, nfields);
900                                         wantcont = FALSE;
901                                         break;
902                                 default:        /* "cannot happen" */
903                                         (void) fprintf(stderr,
904 _("%s: panic: Invalid l_value %d\n"),
905                                                 progname, lp->l_value);
906                                         exit(EXIT_FAILURE);
907                         }
908                 }
909                 ifree((char *) fields);
910         }
911         if (ferror(fp)) {
912                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
913                         progname, filename);
914                 exit(EXIT_FAILURE);
915         }
916         if (fp != stdin && fclose(fp)) {
917                 const char *e = strerror(errno);
918
919                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
920                         progname, filename, e);
921                 exit(EXIT_FAILURE);
922         }
923         if (wantcont)
924                 error(_("expected continuation line not found"));
925 }
926
927 /*
928 ** Convert a string of one of the forms
929 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
930 ** into a number of seconds.
931 ** A null string maps to zero.
932 ** Call error with errstring and return zero on errors.
933 */
934
935 static long
936 gethms(string, errstring, signable)
937 const char *            string;
938 const char * const      errstring;
939 const int               signable;
940 {
941         int     hh, mm, ss, sign;
942
943         if (string == NULL || *string == '\0')
944                 return 0;
945         if (!signable)
946                 sign = 1;
947         else if (*string == '-') {
948                 sign = -1;
949                 ++string;
950         } else  sign = 1;
951         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
952                 mm = ss = 0;
953         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
954                 ss = 0;
955         else if (sscanf(string, scheck(string, "%d:%d:%d"),
956                 &hh, &mm, &ss) != 3) {
957                         error(errstring);
958                         return 0;
959         }
960         if ((hh < 0 || hh >= HOURSPERDAY ||
961                 mm < 0 || mm >= MINSPERHOUR ||
962                 ss < 0 || ss > SECSPERMIN) &&
963                 !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
964                         error(errstring);
965                         return 0;
966         }
967         if (noise && hh == HOURSPERDAY)
968                 warning(_("24:00 not handled by pre-1998 versions of zic"));
969         return eitol(sign) *
970                 (eitol(hh * MINSPERHOUR + mm) *
971                 eitol(SECSPERMIN) + eitol(ss));
972 }
973
974 static void
975 inrule(fields, nfields)
976 register char ** const  fields;
977 const int               nfields;
978 {
979         static struct rule      r;
980
981         if (nfields != RULE_FIELDS) {
982                 error(_("wrong number of fields on Rule line"));
983                 return;
984         }
985         if (*fields[RF_NAME] == '\0') {
986                 error(_("nameless rule"));
987                 return;
988         }
989         r.r_filename = filename;
990         r.r_linenum = linenum;
991         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
992         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
993                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
994         r.r_name = ecpyalloc(fields[RF_NAME]);
995         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
996         rules = (struct rule *) (void *) erealloc((char *) rules,
997                 (int) ((nrules + 1) * sizeof *rules));
998         rules[nrules++] = r;
999 }
1000
1001 static int
1002 inzone(fields, nfields)
1003 register char ** const  fields;
1004 const int               nfields;
1005 {
1006         register int    i;
1007         static char *   buf;
1008
1009         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
1010                 error(_("wrong number of fields on Zone line"));
1011                 return FALSE;
1012         }
1013         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
1014                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
1015                 (void) sprintf(buf,
1016 _("\"Zone %s\" line and -l option are mutually exclusive"),
1017                         TZDEFAULT);
1018                 error(buf);
1019                 return FALSE;
1020         }
1021         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
1022                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
1023                 (void) sprintf(buf,
1024 _("\"Zone %s\" line and -p option are mutually exclusive"),
1025                         TZDEFRULES);
1026                 error(buf);
1027                 return FALSE;
1028         }
1029         for (i = 0; i < nzones; ++i)
1030                 if (zones[i].z_name != NULL &&
1031                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
1032                                 buf = erealloc(buf, (int) (132 +
1033                                         strlen(fields[ZF_NAME]) +
1034                                         strlen(zones[i].z_filename)));
1035                                 (void) sprintf(buf,
1036 _("duplicate zone name %s (file \"%s\", line %d)"),
1037                                         fields[ZF_NAME],
1038                                         zones[i].z_filename,
1039                                         zones[i].z_linenum);
1040                                 error(buf);
1041                                 return FALSE;
1042                 }
1043         return inzsub(fields, nfields, FALSE);
1044 }
1045
1046 static int
1047 inzcont(fields, nfields)
1048 register char ** const  fields;
1049 const int               nfields;
1050 {
1051         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
1052                 error(_("wrong number of fields on Zone continuation line"));
1053                 return FALSE;
1054         }
1055         return inzsub(fields, nfields, TRUE);
1056 }
1057
1058 static int
1059 inzsub(fields, nfields, iscont)
1060 register char ** const  fields;
1061 const int               nfields;
1062 const int               iscont;
1063 {
1064         register char *         cp;
1065         static struct zone      z;
1066         register int            i_gmtoff, i_rule, i_format;
1067         register int            i_untilyear, i_untilmonth;
1068         register int            i_untilday, i_untiltime;
1069         register int            hasuntil;
1070
1071         if (iscont) {
1072                 i_gmtoff = ZFC_GMTOFF;
1073                 i_rule = ZFC_RULE;
1074                 i_format = ZFC_FORMAT;
1075                 i_untilyear = ZFC_TILYEAR;
1076                 i_untilmonth = ZFC_TILMONTH;
1077                 i_untilday = ZFC_TILDAY;
1078                 i_untiltime = ZFC_TILTIME;
1079                 z.z_name = NULL;
1080         } else {
1081                 i_gmtoff = ZF_GMTOFF;
1082                 i_rule = ZF_RULE;
1083                 i_format = ZF_FORMAT;
1084                 i_untilyear = ZF_TILYEAR;
1085                 i_untilmonth = ZF_TILMONTH;
1086                 i_untilday = ZF_TILDAY;
1087                 i_untiltime = ZF_TILTIME;
1088                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1089         }
1090         z.z_filename = filename;
1091         z.z_linenum = linenum;
1092         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1093         if ((cp = strchr(fields[i_format], '%')) != 0) {
1094                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1095                         error(_("invalid abbreviation format"));
1096                         return FALSE;
1097                 }
1098         }
1099         z.z_rule = ecpyalloc(fields[i_rule]);
1100         z.z_format = ecpyalloc(fields[i_format]);
1101         hasuntil = nfields > i_untilyear;
1102         if (hasuntil) {
1103                 z.z_untilrule.r_filename = filename;
1104                 z.z_untilrule.r_linenum = linenum;
1105                 rulesub(&z.z_untilrule,
1106                         fields[i_untilyear],
1107                         "only",
1108                         "",
1109                         (nfields > i_untilmonth) ?
1110                         fields[i_untilmonth] : "Jan",
1111                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1112                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1113                 z.z_untiltime = rpytime(&z.z_untilrule,
1114                         z.z_untilrule.r_loyear);
1115                 if (iscont && nzones > 0 &&
1116                         z.z_untiltime > min_time &&
1117                         z.z_untiltime < max_time &&
1118                         zones[nzones - 1].z_untiltime > min_time &&
1119                         zones[nzones - 1].z_untiltime < max_time &&
1120                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1121                                 error(_(
1122 "Zone continuation line end time is not after end time of previous line"
1123                                         ));
1124                                 return FALSE;
1125                 }
1126         }
1127         zones = (struct zone *) (void *) erealloc((char *) zones,
1128                 (int) ((nzones + 1) * sizeof *zones));
1129         zones[nzones++] = z;
1130         /*
1131         ** If there was an UNTIL field on this line,
1132         ** there's more information about the zone on the next line.
1133         */
1134         return hasuntil;
1135 }
1136
1137 static void
1138 inleap(fields, nfields)
1139 register char ** const  fields;
1140 const int               nfields;
1141 {
1142         register const char *           cp;
1143         register const struct lookup *  lp;
1144         register int                    i, j;
1145         int                             year, month, day;
1146         long                            dayoff, tod;
1147         zic_t                           t;
1148
1149         if (nfields != LEAP_FIELDS) {
1150                 error(_("wrong number of fields on Leap line"));
1151                 return;
1152         }
1153         dayoff = 0;
1154         cp = fields[LP_YEAR];
1155         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1156                 /*
1157                 ** Leapin' Lizards!
1158                 */
1159                 error(_("invalid leaping year"));
1160                 return;
1161         }
1162         j = EPOCH_YEAR;
1163         while (j != year) {
1164                 if (year > j) {
1165                         i = len_years[isleap(j)];
1166                         ++j;
1167                 } else {
1168                         --j;
1169                         i = -len_years[isleap(j)];
1170                 }
1171                 dayoff = oadd(dayoff, eitol(i));
1172         }
1173         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1174                 error(_("invalid month name"));
1175                 return;
1176         }
1177         month = lp->l_value;
1178         j = TM_JANUARY;
1179         while (j != month) {
1180                 i = len_months[isleap(year)][j];
1181                 dayoff = oadd(dayoff, eitol(i));
1182                 ++j;
1183         }
1184         cp = fields[LP_DAY];
1185         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1186                 day <= 0 || day > len_months[isleap(year)][month]) {
1187                         error(_("invalid day of month"));
1188                         return;
1189         }
1190         dayoff = oadd(dayoff, eitol(day - 1));
1191         if (dayoff < 0 && !TYPE_SIGNED(zic_t)) {
1192                 error(_("time before zero"));
1193                 return;
1194         }
1195         if (dayoff < min_time / SECSPERDAY) {
1196                 error(_("time too small"));
1197                 return;
1198         }
1199         if (dayoff > max_time / SECSPERDAY) {
1200                 error(_("time too large"));
1201                 return;
1202         }
1203         t = (zic_t) dayoff * SECSPERDAY;
1204         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1205         cp = fields[LP_CORR];
1206         {
1207                 register int    positive;
1208                 int             count;
1209
1210                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1211                         positive = FALSE;
1212                         count = 1;
1213                 } else if (strcmp(cp, "--") == 0) {
1214                         positive = FALSE;
1215                         count = 2;
1216                 } else if (strcmp(cp, "+") == 0) {
1217                         positive = TRUE;
1218                         count = 1;
1219                 } else if (strcmp(cp, "++") == 0) {
1220                         positive = TRUE;
1221                         count = 2;
1222                 } else {
1223                         error(_("illegal CORRECTION field on Leap line"));
1224                         return;
1225                 }
1226                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1227                         error(_(
1228                                 "illegal Rolling/Stationary field on Leap line"
1229                                 ));
1230                         return;
1231                 }
1232                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1233         }
1234 }
1235
1236 static void
1237 inlink(fields, nfields)
1238 register char ** const  fields;
1239 const int               nfields;
1240 {
1241         struct link     l;
1242
1243         if (nfields != LINK_FIELDS) {
1244                 error(_("wrong number of fields on Link line"));
1245                 return;
1246         }
1247         if (*fields[LF_FROM] == '\0') {
1248                 error(_("blank FROM field on Link line"));
1249                 return;
1250         }
1251         if (*fields[LF_TO] == '\0') {
1252                 error(_("blank TO field on Link line"));
1253                 return;
1254         }
1255         l.l_filename = filename;
1256         l.l_linenum = linenum;
1257         l.l_from = ecpyalloc(fields[LF_FROM]);
1258         l.l_to = ecpyalloc(fields[LF_TO]);
1259         links = (struct link *) (void *) erealloc((char *) links,
1260                 (int) ((nlinks + 1) * sizeof *links));
1261         links[nlinks++] = l;
1262 }
1263
1264 static void
1265 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1266 register struct rule * const    rp;
1267 const char * const              loyearp;
1268 const char * const              hiyearp;
1269 const char * const              typep;
1270 const char * const              monthp;
1271 const char * const              dayp;
1272 const char * const              timep;
1273 {
1274         register const struct lookup *  lp;
1275         register const char *           cp;
1276         register char *                 dp;
1277         register char *                 ep;
1278
1279         if ((lp = byword(monthp, mon_names)) == NULL) {
1280                 error(_("invalid month name"));
1281                 return;
1282         }
1283         rp->r_month = lp->l_value;
1284         rp->r_todisstd = FALSE;
1285         rp->r_todisgmt = FALSE;
1286         dp = ecpyalloc(timep);
1287         if (*dp != '\0') {
1288                 ep = dp + strlen(dp) - 1;
1289                 switch (lowerit(*ep)) {
1290                         case 's':       /* Standard */
1291                                 rp->r_todisstd = TRUE;
1292                                 rp->r_todisgmt = FALSE;
1293                                 *ep = '\0';
1294                                 break;
1295                         case 'w':       /* Wall */
1296                                 rp->r_todisstd = FALSE;
1297                                 rp->r_todisgmt = FALSE;
1298                                 *ep = '\0';
1299                                 break;
1300                         case 'g':       /* Greenwich */
1301                         case 'u':       /* Universal */
1302                         case 'z':       /* Zulu */
1303                                 rp->r_todisstd = TRUE;
1304                                 rp->r_todisgmt = TRUE;
1305                                 *ep = '\0';
1306                                 break;
1307                 }
1308         }
1309         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1310         ifree(dp);
1311         /*
1312         ** Year work.
1313         */
1314         cp = loyearp;
1315         lp = byword(cp, begin_years);
1316         if (lp != NULL) switch ((int) lp->l_value) {
1317                 case YR_MINIMUM:
1318                         rp->r_loyear = INT_MIN;
1319                         break;
1320                 case YR_MAXIMUM:
1321                         rp->r_loyear = INT_MAX;
1322                         break;
1323                 default:        /* "cannot happen" */
1324                         (void) fprintf(stderr,
1325                                 _("%s: panic: Invalid l_value %d\n"),
1326                                 progname, lp->l_value);
1327                         exit(EXIT_FAILURE);
1328         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1329                 error(_("invalid starting year"));
1330                 return;
1331         } else if (noise) {
1332                 if (rp->r_loyear < min_year_representable)
1333                         warning(_("starting year too low to be represented"));
1334                 else if (rp->r_loyear > max_year_representable)
1335                         warning(_("starting year too high to be represented"));
1336         }
1337         cp = hiyearp;
1338         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1339                 case YR_MINIMUM:
1340                         rp->r_hiyear = INT_MIN;
1341                         break;
1342                 case YR_MAXIMUM:
1343                         rp->r_hiyear = INT_MAX;
1344                         break;
1345                 case YR_ONLY:
1346                         rp->r_hiyear = rp->r_loyear;
1347                         break;
1348                 default:        /* "cannot happen" */
1349                         (void) fprintf(stderr,
1350                                 _("%s: panic: Invalid l_value %d\n"),
1351                                 progname, lp->l_value);
1352                         exit(EXIT_FAILURE);
1353         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1354                 error(_("invalid ending year"));
1355                 return;
1356         } else if (noise) {
1357                 if (rp->r_loyear < min_year_representable)
1358                         warning(_("ending year too low to be represented"));
1359                 else if (rp->r_loyear > max_year_representable)
1360                         warning(_("ending year too high to be represented"));
1361         }
1362         if (rp->r_loyear > rp->r_hiyear) {
1363                 error(_("starting year greater than ending year"));
1364                 return;
1365         }
1366         if (*typep == '\0')
1367                 rp->r_yrtype = NULL;
1368         else {
1369                 if (rp->r_loyear == rp->r_hiyear) {
1370                         error(_("typed single year"));
1371                         return;
1372                 }
1373                 rp->r_yrtype = ecpyalloc(typep);
1374         }
1375         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1376                 min_year = rp->r_loyear;
1377         /*
1378         ** Day work.
1379         ** Accept things such as:
1380         **      1
1381         **      last-Sunday
1382         **      Sun<=20
1383         **      Sun>=7
1384         */
1385         dp = ecpyalloc(dayp);
1386         if ((lp = byword(dp, lasts)) != NULL) {
1387                 rp->r_dycode = DC_DOWLEQ;
1388                 rp->r_wday = lp->l_value;
1389                 rp->r_dayofmonth = len_months[1][rp->r_month];
1390         } else {
1391                 if ((ep = strchr(dp, '<')) != 0)
1392                         rp->r_dycode = DC_DOWLEQ;
1393                 else if ((ep = strchr(dp, '>')) != 0)
1394                         rp->r_dycode = DC_DOWGEQ;
1395                 else {
1396                         ep = dp;
1397                         rp->r_dycode = DC_DOM;
1398                 }
1399                 if (rp->r_dycode != DC_DOM) {
1400                         *ep++ = 0;
1401                         if (*ep++ != '=') {
1402                                 error(_("invalid day of month"));
1403                                 ifree(dp);
1404                                 return;
1405                         }
1406                         if ((lp = byword(dp, wday_names)) == NULL) {
1407                                 error(_("invalid weekday name"));
1408                                 ifree(dp);
1409                                 return;
1410                         }
1411                         rp->r_wday = lp->l_value;
1412                 }
1413                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1414                         rp->r_dayofmonth <= 0 ||
1415                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1416                                 error(_("invalid day of month"));
1417                                 ifree(dp);
1418                                 return;
1419                 }
1420         }
1421         ifree(dp);
1422 }
1423
1424 static void
1425 convert(val, buf)
1426 const long      val;
1427 char * const    buf;
1428 {
1429         register int    i;
1430         register long   shift;
1431
1432         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1433                 buf[i] = val >> shift;
1434 }
1435
1436 static void
1437 puttzcode(val, fp)
1438 const long      val;
1439 FILE * const    fp;
1440 {
1441         char    buf[4];
1442
1443         convert(val, buf);
1444         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1445 }
1446
1447 static int
1448 atcomp(avp, bvp)
1449 void *  avp;
1450 void *  bvp;
1451 {
1452         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1453                 return -1;
1454         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1455                 return 1;
1456         else    return 0;
1457 }
1458
1459 static void
1460 writezone(name)
1461 const char * const      name;
1462 {
1463         register FILE *         fp;
1464         register int            i, j;
1465         static char *           fullname;
1466         static struct tzhead    tzh;
1467         zic_t                   ats[TZ_MAX_TIMES];
1468         unsigned char           types[TZ_MAX_TIMES];
1469
1470         /*
1471         ** Sort.
1472         */
1473         if (timecnt > 1)
1474                 (void) qsort((void *) attypes, (size_t) timecnt,
1475                         (size_t) sizeof *attypes, atcomp);
1476         /*
1477         ** Optimize.
1478         */
1479         {
1480                 int     fromi;
1481                 int     toi;
1482
1483                 toi = 0;
1484                 fromi = 0;
1485                 while (fromi < timecnt && attypes[fromi].at < min_time)
1486                         ++fromi;
1487                 if (isdsts[0] == 0)
1488                         while (fromi < timecnt && attypes[fromi].type == 0)
1489                                 ++fromi;        /* handled by default rule */
1490                 for ( ; fromi < timecnt; ++fromi) {
1491                         if (toi != 0 && ((attypes[fromi].at +
1492                                 gmtoffs[attypes[toi - 1].type]) <=
1493                                 (attypes[toi - 1].at + gmtoffs[toi == 1 ? 0
1494                                 : attypes[toi - 2].type]))) {
1495                                         attypes[toi - 1].type =
1496                                                 attypes[fromi].type;
1497                                         continue;
1498                         }
1499                         if (toi == 0 ||
1500                                 attypes[toi - 1].type != attypes[fromi].type)
1501                                         attypes[toi++] = attypes[fromi];
1502                 }
1503                 timecnt = toi;
1504         }
1505         /*
1506         ** Transfer.
1507         */
1508         for (i = 0; i < timecnt; ++i) {
1509                 ats[i] = attypes[i].at;
1510                 types[i] = attypes[i].type;
1511         }
1512         fullname = erealloc(fullname,
1513                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1514         (void) sprintf(fullname, "%s/%s", directory, name);
1515         /*
1516         ** Remove old file, if any, to snap links.
1517         */
1518         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1519                 const char *e = strerror(errno);
1520
1521                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1522                         progname, fullname, e);
1523                 exit(EXIT_FAILURE);
1524         }
1525         if ((fp = fopen(fullname, "wb")) == NULL) {
1526                 if (mkdirs(fullname) != 0)
1527                         exit(EXIT_FAILURE);
1528                 if ((fp = fopen(fullname, "wb")) == NULL) {
1529                         const char *e = strerror(errno);
1530
1531                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1532                                 progname, fullname, e);
1533                         exit(EXIT_FAILURE);
1534                 }
1535         }
1536         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1537         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1538         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1539         convert(eitol(timecnt), tzh.tzh_timecnt);
1540         convert(eitol(typecnt), tzh.tzh_typecnt);
1541         convert(eitol(charcnt), tzh.tzh_charcnt);
1542         (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1543 #define DO(field)       (void) fwrite((void *) tzh.field, \
1544                                 (size_t) sizeof tzh.field, (size_t) 1, fp)
1545         DO(tzh_magic);
1546         DO(tzh_reserved);
1547         DO(tzh_ttisgmtcnt);
1548         DO(tzh_ttisstdcnt);
1549         DO(tzh_leapcnt);
1550         DO(tzh_timecnt);
1551         DO(tzh_typecnt);
1552         DO(tzh_charcnt);
1553 #undef DO
1554         for (i = 0; i < timecnt; ++i) {
1555                 j = leapcnt;
1556                 while (--j >= 0)
1557                         if (ats[i] >= trans[j]) {
1558                                 ats[i] = tadd(ats[i], corr[j]);
1559                                 break;
1560                         }
1561                 puttzcode((long) ats[i], fp);
1562         }
1563         if (timecnt > 0)
1564                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1565                         (size_t) timecnt, fp);
1566         for (i = 0; i < typecnt; ++i) {
1567                 puttzcode((long) gmtoffs[i], fp);
1568                 (void) putc(isdsts[i], fp);
1569                 (void) putc(abbrinds[i], fp);
1570         }
1571         if (charcnt != 0)
1572                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1573                         (size_t) charcnt, fp);
1574         for (i = 0; i < leapcnt; ++i) {
1575                 if (roll[i]) {
1576                         if (timecnt == 0 || trans[i] < ats[0]) {
1577                                 j = 0;
1578                                 while (isdsts[j])
1579                                         if (++j >= typecnt) {
1580                                                 j = 0;
1581                                                 break;
1582                                         }
1583                         } else {
1584                                 j = 1;
1585                                 while (j < timecnt && trans[i] >= ats[j])
1586                                         ++j;
1587                                 j = types[j - 1];
1588                         }
1589                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1590                 } else  puttzcode((long) trans[i], fp);
1591                 puttzcode((long) corr[i], fp);
1592         }
1593         for (i = 0; i < typecnt; ++i)
1594                 (void) putc(ttisstds[i], fp);
1595         for (i = 0; i < typecnt; ++i)
1596                 (void) putc(ttisgmts[i], fp);
1597         if (ferror(fp) || fclose(fp)) {
1598                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1599                         progname, fullname);
1600                 exit(EXIT_FAILURE);
1601         }
1602 }
1603
1604 static void
1605 doabbr(abbr, format, letters, isdst)
1606 char * const            abbr;
1607 const char * const      format;
1608 const char * const      letters;
1609 const int               isdst;
1610 {
1611         if (strchr(format, '/') == NULL) {
1612                 if (letters == NULL)
1613                         (void) strcpy(abbr, format);
1614                 else    (void) sprintf(abbr, format, letters);
1615         } else if (isdst)
1616                 (void) strcpy(abbr, strchr(format, '/') + 1);
1617         else {
1618                 (void) strcpy(abbr, format);
1619                 *strchr(abbr, '/') = '\0';
1620         }
1621 }
1622
1623 static void
1624 outzone(zpfirst, zonecount)
1625 const struct zone * const       zpfirst;
1626 const int                       zonecount;
1627 {
1628         register const struct zone *    zp;
1629         register struct rule *          rp;
1630         register int                    i, j;
1631         register int                    usestart, useuntil;
1632         register zic_t                  starttime, untiltime;
1633         register long                   gmtoff;
1634         register long                   stdoff;
1635         register int                    year;
1636         register long                   startoff;
1637         register int                    startttisstd;
1638         register int                    startttisgmt;
1639         register int                    type;
1640         char                            startbuf[BUFSIZ];
1641
1642         INITIALIZE(untiltime);
1643         INITIALIZE(starttime);
1644         /*
1645         ** Now. . .finally. . .generate some useful data!
1646         */
1647         timecnt = 0;
1648         typecnt = 0;
1649         charcnt = 0;
1650         /*
1651         ** Thanks to Earl Chew
1652         ** for noting the need to unconditionally initialize startttisstd.
1653         */
1654         startttisstd = FALSE;
1655         startttisgmt = FALSE;
1656         for (i = 0; i < zonecount; ++i) {
1657                 /*
1658                 ** A guess that may well be corrected later.
1659                 */
1660                 stdoff = 0;
1661                 zp = &zpfirst[i];
1662                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1663                 useuntil = i < (zonecount - 1);
1664                 if (useuntil && zp->z_untiltime <= min_time)
1665                         continue;
1666                 gmtoff = zp->z_gmtoff;
1667                 eat(zp->z_filename, zp->z_linenum);
1668                 *startbuf = '\0';
1669                 startoff = zp->z_gmtoff;
1670                 if (zp->z_nrules == 0) {
1671                         stdoff = zp->z_stdoff;
1672                         doabbr(startbuf, zp->z_format,
1673                                 (char *) NULL, stdoff != 0);
1674                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1675                                 startbuf, stdoff != 0, startttisstd,
1676                                 startttisgmt);
1677                         if (usestart) {
1678                                 addtt(starttime, type);
1679                                 usestart = FALSE;
1680                         } else if (stdoff != 0)
1681                                 addtt(min_time, type);
1682                 } else for (year = min_year; year <= max_year; ++year) {
1683                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1684                                 break;
1685                         /*
1686                         ** Mark which rules to do in the current year.
1687                         ** For those to do, calculate rpytime(rp, year);
1688                         */
1689                         for (j = 0; j < zp->z_nrules; ++j) {
1690                                 rp = &zp->z_rules[j];
1691                                 eats(zp->z_filename, zp->z_linenum,
1692                                         rp->r_filename, rp->r_linenum);
1693                                 rp->r_todo = year >= rp->r_loyear &&
1694                                                 year <= rp->r_hiyear &&
1695                                                 yearistype(year, rp->r_yrtype);
1696                                 if (rp->r_todo)
1697                                         rp->r_temp = rpytime(rp, year);
1698                         }
1699                         for ( ; ; ) {
1700                                 register int    k;
1701                                 register zic_t  jtime, ktime;
1702                                 register long   offset;
1703                                 char            buf[BUFSIZ];
1704
1705                                 INITIALIZE(ktime);
1706                                 if (useuntil) {
1707                                         /*
1708                                         ** Turn untiltime into UTC
1709                                         ** assuming the current gmtoff and
1710                                         ** stdoff values.
1711                                         */
1712                                         untiltime = zp->z_untiltime;
1713                                         if (!zp->z_untilrule.r_todisgmt)
1714                                                 untiltime = tadd(untiltime,
1715                                                         -gmtoff);
1716                                         if (!zp->z_untilrule.r_todisstd)
1717                                                 untiltime = tadd(untiltime,
1718                                                         -stdoff);
1719                                 }
1720                                 /*
1721                                 ** Find the rule (of those to do, if any)
1722                                 ** that takes effect earliest in the year.
1723                                 */
1724                                 k = -1;
1725                                 for (j = 0; j < zp->z_nrules; ++j) {
1726                                         rp = &zp->z_rules[j];
1727                                         if (!rp->r_todo)
1728                                                 continue;
1729                                         eats(zp->z_filename, zp->z_linenum,
1730                                                 rp->r_filename, rp->r_linenum);
1731                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1732                                         if (!rp->r_todisstd)
1733                                                 offset = oadd(offset, stdoff);
1734                                         jtime = rp->r_temp;
1735                                         if (jtime == min_time ||
1736                                                 jtime == max_time)
1737                                                         continue;
1738                                         jtime = tadd(jtime, -offset);
1739                                         if (k < 0 || jtime < ktime) {
1740                                                 k = j;
1741                                                 ktime = jtime;
1742                                         }
1743                                 }
1744                                 if (k < 0)
1745                                         break;  /* go on to next year */
1746                                 rp = &zp->z_rules[k];
1747                                 rp->r_todo = FALSE;
1748                                 if (useuntil && ktime >= untiltime)
1749                                         break;
1750                                 stdoff = rp->r_stdoff;
1751                                 if (usestart && ktime == starttime)
1752                                         usestart = FALSE;
1753                                 if (usestart) {
1754                                         if (ktime < starttime) {
1755                                                 startoff = oadd(zp->z_gmtoff,
1756                                                         stdoff);
1757                                                 doabbr(startbuf, zp->z_format,
1758                                                         rp->r_abbrvar,
1759                                                         rp->r_stdoff != 0);
1760                                                 continue;
1761                                         }
1762                                         if (*startbuf == '\0' &&
1763                                                 startoff == oadd(zp->z_gmtoff,
1764                                                 stdoff))
1765                                                         doabbr(startbuf,
1766                                                                 zp->z_format,
1767                                                                 rp->r_abbrvar,
1768                                                                 rp->r_stdoff !=
1769                                                                 0);
1770                                 }
1771                                 eats(zp->z_filename, zp->z_linenum,
1772                                         rp->r_filename, rp->r_linenum);
1773                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1774                                         rp->r_stdoff != 0);
1775                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1776                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1777                                         rp->r_todisstd, rp->r_todisgmt);
1778                                 addtt(ktime, type);
1779                         }
1780                 }
1781                 if (usestart) {
1782                         if (*startbuf == '\0' &&
1783                                 zp->z_format != NULL &&
1784                                 strchr(zp->z_format, '%') == NULL &&
1785                                 strchr(zp->z_format, '/') == NULL)
1786                                         (void) strcpy(startbuf, zp->z_format);
1787                         eat(zp->z_filename, zp->z_linenum);
1788                         if (*startbuf == '\0')
1789 error(_("can't determine time zone abbreviation to use just after until time"));
1790                         else    addtt(starttime,
1791                                         addtype(startoff, startbuf,
1792                                                 startoff != zp->z_gmtoff,
1793                                                 startttisstd,
1794                                                 startttisgmt));
1795                 }
1796                 /*
1797                 ** Now we may get to set starttime for the next zone line.
1798                 */
1799                 if (useuntil) {
1800                         startttisstd = zp->z_untilrule.r_todisstd;
1801                         startttisgmt = zp->z_untilrule.r_todisgmt;
1802                         starttime = zp->z_untiltime;
1803                         if (!startttisstd)
1804                                 starttime = tadd(starttime, -stdoff);
1805                         if (!startttisgmt)
1806                                 starttime = tadd(starttime, -gmtoff);
1807                 }
1808         }
1809         writezone(zpfirst->z_name);
1810 }
1811
1812 static void
1813 addtt(starttime, type)
1814 const zic_t     starttime;
1815 int             type;
1816 {
1817         if (starttime <= min_time ||
1818                 (timecnt == 1 && attypes[0].at < min_time)) {
1819                 gmtoffs[0] = gmtoffs[type];
1820                 isdsts[0] = isdsts[type];
1821                 ttisstds[0] = ttisstds[type];
1822                 ttisgmts[0] = ttisgmts[type];
1823                 if (abbrinds[type] != 0)
1824                         (void) strcpy(chars, &chars[abbrinds[type]]);
1825                 abbrinds[0] = 0;
1826                 charcnt = strlen(chars) + 1;
1827                 typecnt = 1;
1828                 timecnt = 0;
1829                 type = 0;
1830         }
1831         if (timecnt >= TZ_MAX_TIMES) {
1832                 error(_("too many transitions?!"));
1833                 exit(EXIT_FAILURE);
1834         }
1835         attypes[timecnt].at = starttime;
1836         attypes[timecnt].type = type;
1837         ++timecnt;
1838 }
1839
1840 static int
1841 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1842 const long              gmtoff;
1843 const char * const      abbr;
1844 const int               isdst;
1845 const int               ttisstd;
1846 const int               ttisgmt;
1847 {
1848         register int    i, j;
1849
1850         if (isdst != TRUE && isdst != FALSE) {
1851                 error(_("internal error - addtype called with bad isdst"));
1852                 exit(EXIT_FAILURE);
1853         }
1854         if (ttisstd != TRUE && ttisstd != FALSE) {
1855                 error(_("internal error - addtype called with bad ttisstd"));
1856                 exit(EXIT_FAILURE);
1857         }
1858         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1859                 error(_("internal error - addtype called with bad ttisgmt"));
1860                 exit(EXIT_FAILURE);
1861         }
1862         /*
1863         ** See if there's already an entry for this zone type.
1864         ** If so, just return its index.
1865         */
1866         for (i = 0; i < typecnt; ++i) {
1867                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1868                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1869                         ttisstd == ttisstds[i] &&
1870                         ttisgmt == ttisgmts[i])
1871                                 return i;
1872         }
1873         /*
1874         ** There isn't one; add a new one, unless there are already too
1875         ** many.
1876         */
1877         if (typecnt >= TZ_MAX_TYPES) {
1878                 error(_("too many local time types"));
1879                 exit(EXIT_FAILURE);
1880         }
1881         gmtoffs[i] = gmtoff;
1882         isdsts[i] = isdst;
1883         ttisstds[i] = ttisstd;
1884         ttisgmts[i] = ttisgmt;
1885
1886         for (j = 0; j < charcnt; ++j)
1887                 if (strcmp(&chars[j], abbr) == 0)
1888                         break;
1889         if (j == charcnt)
1890                 newabbr(abbr);
1891         abbrinds[i] = j;
1892         ++typecnt;
1893         return i;
1894 }
1895
1896 static void
1897 leapadd(t, positive, rolling, count)
1898 const zic_t     t;
1899 const int       positive;
1900 const int       rolling;
1901 int             count;
1902 {
1903         register int    i, j;
1904
1905         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1906                 error(_("too many leap seconds"));
1907                 exit(EXIT_FAILURE);
1908         }
1909         for (i = 0; i < leapcnt; ++i)
1910                 if (t <= trans[i]) {
1911                         if (t == trans[i]) {
1912                                 error(_("repeated leap second moment"));
1913                                 exit(EXIT_FAILURE);
1914                         }
1915                         break;
1916                 }
1917         do {
1918                 for (j = leapcnt; j > i; --j) {
1919                         trans[j] = trans[j - 1];
1920                         corr[j] = corr[j - 1];
1921                         roll[j] = roll[j - 1];
1922                 }
1923                 trans[i] = t;
1924                 corr[i] = positive ? 1L : eitol(-count);
1925                 roll[i] = rolling;
1926                 ++leapcnt;
1927         } while (positive && --count != 0);
1928 }
1929
1930 static void
1931 adjleap P((void))
1932 {
1933         register int    i;
1934         register long   last = 0;
1935
1936         /*
1937         ** propagate leap seconds forward
1938         */
1939         for (i = 0; i < leapcnt; ++i) {
1940                 trans[i] = tadd(trans[i], last);
1941                 last = corr[i] += last;
1942         }
1943 }
1944
1945 static int
1946 yearistype(year, type)
1947 const int               year;
1948 const char * const      type;
1949 {
1950         static char *   buf;
1951         int             result;
1952
1953         if (type == NULL || *type == '\0')
1954                 return TRUE;
1955         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1956         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1957         result = system(buf);
1958         if (WIFEXITED(result)) switch (WEXITSTATUS(result)) {
1959                 case 0:
1960                         return TRUE;
1961                 case 1:
1962                         return FALSE;
1963         }
1964         error(_("Wild result from command execution"));
1965         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1966                 progname, buf, result);
1967         for ( ; ; )
1968                 exit(EXIT_FAILURE);
1969 }
1970
1971 static int
1972 lowerit(a)
1973 int     a;
1974 {
1975         a = (unsigned char) a;
1976         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1977 }
1978
1979 static int
1980 ciequal(ap, bp)         /* case-insensitive equality */
1981 register const char *   ap;
1982 register const char *   bp;
1983 {
1984         while (lowerit(*ap) == lowerit(*bp++))
1985                 if (*ap++ == '\0')
1986                         return TRUE;
1987         return FALSE;
1988 }
1989
1990 static int
1991 itsabbr(abbr, word)
1992 register const char *   abbr;
1993 register const char *   word;
1994 {
1995         if (lowerit(*abbr) != lowerit(*word))
1996                 return FALSE;
1997         ++word;
1998         while (*++abbr != '\0')
1999                 do {
2000                         if (*word == '\0')
2001                                 return FALSE;
2002                 } while (lowerit(*word++) != lowerit(*abbr));
2003         return TRUE;
2004 }
2005
2006 static const struct lookup *
2007 byword(word, table)
2008 register const char * const             word;
2009 register const struct lookup * const    table;
2010 {
2011         register const struct lookup *  foundlp;
2012         register const struct lookup *  lp;
2013
2014         if (word == NULL || table == NULL)
2015                 return NULL;
2016         /*
2017         ** Look for exact match.
2018         */
2019         for (lp = table; lp->l_word != NULL; ++lp)
2020                 if (ciequal(word, lp->l_word))
2021                         return lp;
2022         /*
2023         ** Look for inexact match.
2024         */
2025         foundlp = NULL;
2026         for (lp = table; lp->l_word != NULL; ++lp)
2027                 if (itsabbr(word, lp->l_word)) {
2028                         if (foundlp == NULL)
2029                                 foundlp = lp;
2030                         else    return NULL;    /* multiple inexact matches */
2031                 }
2032         return foundlp;
2033 }
2034
2035 static char **
2036 getfields(cp)
2037 register char * cp;
2038 {
2039         register char *         dp;
2040         register char **        array;
2041         register int            nsubs;
2042
2043         if (cp == NULL)
2044                 return NULL;
2045         array = (char **) (void *)
2046                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
2047         nsubs = 0;
2048         for ( ; ; ) {
2049                 while (isascii((unsigned char) *cp) &&
2050                         isspace((unsigned char) *cp))
2051                                 ++cp;
2052                 if (*cp == '\0' || *cp == '#')
2053                         break;
2054                 array[nsubs++] = dp = cp;
2055                 do {
2056                         if ((*dp = *cp++) != '"')
2057                                 ++dp;
2058                         else while ((*dp = *cp++) != '"')
2059                                 if (*dp != '\0')
2060                                         ++dp;
2061                                 else    error(_(
2062                                                 "Odd number of quotation marks"
2063                                                 ));
2064                 } while (*cp != '\0' && *cp != '#' &&
2065                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
2066                 if (isascii(*cp) && isspace((unsigned char) *cp))
2067                         ++cp;
2068                 *dp = '\0';
2069         }
2070         array[nsubs] = NULL;
2071         return array;
2072 }
2073
2074 static long
2075 oadd(t1, t2)
2076 const long      t1;
2077 const long      t2;
2078 {
2079         register long   t;
2080
2081         t = t1 + t2;
2082         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2083                 error(_("time overflow"));
2084                 exit(EXIT_FAILURE);
2085         }
2086         return t;
2087 }
2088
2089 static zic_t
2090 tadd(t1, t2)
2091 const zic_t     t1;
2092 const long      t2;
2093 {
2094         register zic_t  t;
2095
2096         if (t1 == max_time && t2 > 0)
2097                 return max_time;
2098         if (t1 == min_time && t2 < 0)
2099                 return min_time;
2100         t = t1 + t2;
2101         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2102                 error(_("time overflow"));
2103                 exit(EXIT_FAILURE);
2104         }
2105         return t;
2106 }
2107
2108 /*
2109 ** Given a rule, and a year, compute the date - in seconds since January 1,
2110 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2111 */
2112
2113 static zic_t
2114 rpytime(rp, wantedy)
2115 register const struct rule * const      rp;
2116 register const int                      wantedy;
2117 {
2118         register int    y, m, i;
2119         register long   dayoff;                 /* with a nod to Margaret O. */
2120         register zic_t  t;
2121
2122         if (wantedy == INT_MIN)
2123                 return min_time;
2124         if (wantedy == INT_MAX)
2125                 return max_time;
2126         dayoff = 0;
2127         m = TM_JANUARY;
2128         y = EPOCH_YEAR;
2129         while (wantedy != y) {
2130                 if (wantedy > y) {
2131                         i = len_years[isleap(y)];
2132                         ++y;
2133                 } else {
2134                         --y;
2135                         i = -len_years[isleap(y)];
2136                 }
2137                 dayoff = oadd(dayoff, eitol(i));
2138         }
2139         while (m != rp->r_month) {
2140                 i = len_months[isleap(y)][m];
2141                 dayoff = oadd(dayoff, eitol(i));
2142                 ++m;
2143         }
2144         i = rp->r_dayofmonth;
2145         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2146                 if (rp->r_dycode == DC_DOWLEQ)
2147                         --i;
2148                 else {
2149                         error(_("use of 2/29 in non leap-year"));
2150                         exit(EXIT_FAILURE);
2151                 }
2152         }
2153         --i;
2154         dayoff = oadd(dayoff, eitol(i));
2155         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2156                 register long   wday;
2157
2158 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2159                 wday = eitol(EPOCH_WDAY);
2160                 /*
2161                 ** Don't trust mod of negative numbers.
2162                 */
2163                 if (dayoff >= 0)
2164                         wday = (wday + dayoff) % LDAYSPERWEEK;
2165                 else {
2166                         wday -= ((-dayoff) % LDAYSPERWEEK);
2167                         if (wday < 0)
2168                                 wday += LDAYSPERWEEK;
2169                 }
2170                 while (wday != eitol(rp->r_wday))
2171                         if (rp->r_dycode == DC_DOWGEQ) {
2172                                 dayoff = oadd(dayoff, (long) 1);
2173                                 if (++wday >= LDAYSPERWEEK)
2174                                         wday = 0;
2175                                 ++i;
2176                         } else {
2177                                 dayoff = oadd(dayoff, (long) -1);
2178                                 if (--wday < 0)
2179                                         wday = LDAYSPERWEEK - 1;
2180                                 --i;
2181                         }
2182                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2183                         if (noise)
2184                                 warning(_("rule goes past start/end of month--\
2185 will not work with pre-2004 versions of zic"));
2186                 }
2187         }
2188         if (dayoff < 0 && !TYPE_SIGNED(zic_t))
2189                 return min_time;
2190         if (dayoff < min_time / SECSPERDAY)
2191                 return min_time;
2192         if (dayoff > max_time / SECSPERDAY)
2193                 return max_time;
2194         t = (zic_t) dayoff * SECSPERDAY;
2195         return tadd(t, rp->r_tod);
2196 }
2197
2198 static void
2199 newabbr(string)
2200 const char * const      string;
2201 {
2202         register int    i;
2203
2204         if (strcmp(string, GRANDPARENTED) != 0) {
2205                 register const char *   cp;
2206                 register char *         wp;
2207
2208                 /*
2209                 ** Want one to ZIC_MAX_ABBR_LEN_WO_WARN alphabetics
2210                 ** optionally followed by a + or - and a number from 1 to 14.
2211                 */
2212                 cp = string;
2213                 wp = NULL;
2214                 while (isascii((unsigned char) *cp) &&
2215                         isalpha((unsigned char) *cp))
2216                                 ++cp;
2217                 if (cp - string == 0)
2218 wp = _("time zone abbreviation lacks alphabetic at start");
2219                 if (noise && cp - string > 3)
2220 wp = _("time zone abbreviation has more than 3 alphabetics");
2221                 if (cp - string > ZIC_MAX_ABBR_LEN_WO_WARN)
2222 wp = _("time zone abbreviation has too many alphabetics");
2223                 if (wp == NULL && (*cp == '+' || *cp == '-')) {
2224                         ++cp;
2225                         if (isascii((unsigned char) *cp) &&
2226                                 isdigit((unsigned char) *cp))
2227                                         if (*cp++ == '1' &&
2228                                                 *cp >= '0' && *cp <= '4')
2229                                                         ++cp;
2230                 }
2231                 if (*cp != '\0')
2232 wp = _("time zone abbreviation differs from POSIX standard");
2233                 if (wp != NULL) {
2234                         wp = ecpyalloc(wp);
2235                         wp = ecatalloc(wp, " (");
2236                         wp = ecatalloc(wp, string);
2237                         wp = ecatalloc(wp, ")");
2238                         warning(wp);
2239                         ifree(wp);
2240                 }
2241         }
2242         i = strlen(string) + 1;
2243         if (charcnt + i > TZ_MAX_CHARS) {
2244                 error(_("too many, or too long, time zone abbreviations"));
2245                 exit(EXIT_FAILURE);
2246         }
2247         (void) strcpy(&chars[charcnt], string);
2248         charcnt += eitol(i);
2249 }
2250
2251 static int
2252 mkdirs(argname)
2253 char * const    argname;
2254 {
2255         register char * name;
2256         register char * cp;
2257
2258         if (argname == NULL || *argname == '\0')
2259                 return 0;
2260         cp = name = ecpyalloc(argname);
2261         while ((cp = strchr(cp + 1, '/')) != 0) {
2262                 *cp = '\0';
2263 #ifndef unix
2264                 /*
2265                 ** DOS drive specifier?
2266                 */
2267                 if (isalpha((unsigned char) name[0]) &&
2268                         name[1] == ':' && name[2] == '\0') {
2269                                 *cp = '/';
2270                                 continue;
2271                 }
2272 #endif /* !defined unix */
2273                 if (!itsdir(name)) {
2274                         /*
2275                         ** It doesn't seem to exist, so we try to create it.
2276                         ** Creation may fail because of the directory being
2277                         ** created by some other multiprocessor, so we get
2278                         ** to do extra checking.
2279                         */
2280                         if (mkdir(name, MKDIR_UMASK) != 0) {
2281                                 const char *e = strerror(errno);
2282
2283                                 if (errno != EEXIST || !itsdir(name)) {
2284                                         (void) fprintf(stderr,
2285 _("%s: Can't create directory %s: %s\n"),
2286                                                 progname, name, e);
2287                                         ifree(name);
2288                                         return -1;
2289                                 }
2290                         }
2291                 }
2292                 *cp = '/';
2293         }
2294         ifree(name);
2295         return 0;
2296 }
2297
2298 static long
2299 eitol(i)
2300 const int       i;
2301 {
2302         long    l;
2303
2304         l = i;
2305         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2306                 (void) fprintf(stderr,
2307                         _("%s: %d did not sign extend correctly\n"),
2308                         progname, i);
2309                 exit(EXIT_FAILURE);
2310         }
2311         return l;
2312 }
2313
2314 /*
2315 ** UNIX was a registered trademark of The Open Group in 2003.
2316 */